it would be best to take the free class and check it out. You've done royce gracie so you're used to gi...no gi is very different. You can take the class, ask questions and roll. I would go take advantage of the free class at all of the local schools and go with the teach you feel most comfortable with. Advantages and disadvantages? I don't really get the question...it's a little different, but it's still brazillian jiu jitsu. There aren't huge fundamental differences. That's why I say take the free class to get how the instructor is teaching and how the class operates.